I am looking for the procedure for checking the copper surface after LPI pre-cleaning. I thought that there was an IPC test method to check for any residues on the copper surface after cleaning and before LPI. Does anyone have a test method. Also would be interested in knowing what type of cleaning procedures people use prior to LPI screening. We have a serious problem with oxidation after cleaning and before screening LPI. Thanks ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################